How do I use states in jmock?

Question

I'm writing an integration test that simulates a sequence of actions coming from the front end. I'm setting up my expectations like this:

context.checking(new Expectations() {{
  States state = states("service");

  allowing(service).getPendingTxn();
  will(returnValue(null));
  when(state.isNot("has-pending-txn"));

  one(service).createPendingTxn();
  will(returnValue(txnId));
  then(state.is("has-pending-txn"));

  allowing(service).getPendingTxn();
  will(returnValue(transaction));
  when(state.is("has-pending-txn"));
}});

The code under test then makes the calls in that order.

This isn't working for me. It looks like service.getPendingTxn() is returning a jMock null object, rather than the supplied values. I think I'm doing something wrong when I write both will(...) and when(...) after an expectation, but I'm not sure.

Is there something I'm missing here?

Thanks. Typo while cleaning up internal names. This is working for me now, I think I may have had another expectation that was hiding the one with the state associated with it. — Kevin Peterson
@KevinPeterson Can you post a short answer and accept it so we know this is closed? — Duncan Jones

Kevin Peterson Kevin Peterson · Accepted Answer · 2012-10-05T18:29:40

Per Duncan's suggestion, the answer is that that's exactly how you use states. I had another problem in the test that I incorrectly attributed to being related to states.

How do I use states in jmock?

1 Answers